High pressure water jet cutting apparatus and method for rock-wall crane girder in underground cavern powerhouse

A high pressure water jet cutting apparatus for a rock-wall crane girder in an underground cavern powerhouse, comprising at least:

• a guiding mechanism, a support mechanism, and a jet cutting mechanism, wherein
• the guiding mechanism is detachably connected to a steel tube frame which is erected according to drilling positions, and the support mechanism is connected to the guiding mechanism and is capable of moving on the guiding mechanism;
• the support mechanism is connected to the jet cutting mechanism, the support mechanism is configured to adjust an angle of a hollow jet pipeline protection tube of the jet cutting mechanism, a tail end of the hollow jet pipeline protection tube is connected to a nozzle, and the steel tube frame is connected to a positioning steel tube through which the hollow jet pipeline protection tube passes;
• the nozzle is a bent-shaped nozzle, and an included angle between a vertical tube and a horizontal tube of the bent-shaped nozzle is greater than 90°, so that a jet direction of the nozzle is offset by a set angle relative to a plane perpendicular to the vertical tube;
• the support mechanism at least comprises:
• a second drive mechanism, a floating positioning mechanism, a third drive mechanism, and a rack;
• the hollow jet pipeline protection tube is connected to the floating positioning mechanism, the floating positioning mechanism is connected to the second drive mechanism, a support of the second drive mechanism is movably connected to the rack, an output end of the third drive mechanism is connected to the support to adjust a working angle of the hollow jet pipeline protection tube, and the third drive mechanism is connected to the rack;
• and
• the floating positioning mechanism comprises a rear-end floating positioning mechanism and a front-end floating positioning mechanism, there are two hollow jet pipeline protection tubes, and there are two groups of corresponding floating positioning mechanisms, and the two groups of floating positioning mechanisms are relatively independent and are capable of being adjusted respectively.